如何在Swift上完成触摸拖动后刷新？

let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
yourView.addGestureRecognizer(panGesture)

@objc func handlePan(_ gesture: UIPanGestureRecognizer) {
    if gesture.state == .changed {
        // 在这里处理拖动手势的逻辑
    }
}

@objc func handlePan(_ gesture: UIPanGestureRecognizer) {
    if gesture.state == .changed {
        let translation = gesture.translation(in: yourView)
        let velocity = gesture.velocity(in: yourView)
        
        // 根据手势的位移和速度等信息更新视图或执行其他操作
    }
}

@objc func handlePan(_ gesture: UIPanGestureRecognizer) {
    if gesture.state == .changed {
        let translation = gesture.translation(in: yourView)
        let velocity = gesture.velocity(in: yourView)
        
        // 根据手势的位移和速度等信息更新视图或执行其他操作
        
        yourView.setNeedsDisplay() // 刷新视图
    }
}